PDF malware analysis — malicious · b8689ec4d65b46ed

MALICIOUS

PDF

32.6 KB Created: 2020-09-01 02:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1e1cab1cf2f6c69b21d20903f39f0df7 SHA-1: ed427762a7bc2b8072a814bb220895d367bd4885 SHA-256: b8689ec4d65b46edd7f4b803b61e0982c0143273b20ce51691b27719f6933ed3

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, includes text related to an 'exceptional family member program physical exam form', suggesting a social engineering pretext. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.ru/wix?keyword=exceptional+family+member+program+physical+exam+form
- https://cdn.shopify.com/s/files/1/0428/8384/2215/files/annals_of_surgical_case_reports_impact_factor.pdf
- https://cdn.shopify.com/s/files/1/0429/7441/2949/files/bernoulli_distribution_and_cdf.pdf
- https://cdn.shopify.com/s/files/1/0429/2041/1303/files/ieee_paper_format_example.pdf
- https://cdn.shopify.com/s/files/1/0428/8921/6163/files/kobatozobibaxixil.pdf
- https://cdn.shopify.com/s/files/1/0431/3900/6632/files/xobujaloludowowirokanule.pdf
- https://static.usrfiles.com/ugd/b8c837_928da8534db641c1a63a7a9cb8334c3c.pdf
- https://static.usrfiles.com/ugd/909b15_b1d2d2bc6fae4ab596fa7a846486fcd2.pdf
- https://static.usrfiles.com/ugd/5ecadc_fb111b0cc250412990b283382b4e621f.pdf
- https://static.usrfiles.com/ugd/b8c837_5cb0cda1480f47419fa40babc8d9a77b.pdf
- https://static.usrfiles.com/ugd/b8c837_e37f0d60dca64d2186135b4c078352fe.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000420f.bin` `0dccdaa7898d10f14a0ab3ff4db96f5235af242ad3bb63d274ed341e1efbf4ce`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x420F	5696 bytes
`font_01_sfnt_off00005556.bin` `50a654d725804504e05cd46e9c5e6423e2ab8cc64bfe931ee2df1907b52ea6f8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5556	9448 bytes

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